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Property, plant and equipment (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Jun. 30, 2016
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         $ 4,655,586,000    
Impairment charges         358,330,000 $ 361,989,000  
Property, plant and equipment, End of year $ 4,191,892,000   $ 4,655,586,000   4,191,892,000 4,655,586,000  
Contracutal capital commitments 23,000,000       23,000,000    
Uranium [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Impairment charges         246,931,000 $ 361,989,000  
Uranium [Member] | Non-recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Rabbit Lake Mill [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Fair value less cost to sell discount rate     8.00%     8.00%  
Uranium [Member] | Non-recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | US operations [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Recoverable amount 133,228,000       133,228,000   $ 106,200,000
Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         9,176,181,000 $ 9,171,348,000  
Additions         143,333,000 216,908,000  
Transfers         0 0  
Change in reclamation provision         17,541,000 (23,124,000)  
Disposals         (88,473,000) (115,645,000)  
Pre-commerical production revenue [1]         (29,305,000)    
Effect of movements in exchange rates         (78,702,000) (73,306,000)  
Property, plant and equipment, End of year 9,140,575,000   $ 9,176,181,000   9,140,575,000 9,176,181,000  
Cost [member] | Uranium [Member] | Inkai [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Pre-commerical production revenue         29,305,000    
Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         4,520,595,000 3,943,188,000  
Depreciation charge         320,197,000 333,611,000  
Transfers         0 0  
Disposals         (79,951,000) (90,114,000)  
Impairment charges         239,781,000 [2],[3] 361,989,000 [4],[5]  
Effect of movements in exchange rates         (51,939,000) (28,079,000)  
Property, plant and equipment, End of year 4,948,683,000   4,520,595,000   4,948,683,000 4,520,595,000  
Accumulated depreciation and impairment [Member] | Uranium [Member] | Kintyre [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Impairment charges     237,621,000        
Accumulated depreciation and impairment [Member] | Uranium [Member] | Rabbit Lake Mill [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Impairment charges       $ 124,368,000      
Accumulated depreciation and impairment [Member] | Uranium [Member] | US operations [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Impairment charges 184,448,000 $ 144,450,000          
Land and buildgings [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         2,471,277,000    
Property, plant and equipment, End of year 2,327,863,000   2,471,277,000   2,327,863,000 2,471,277,000  
Land and buildgings [Member] | Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         4,979,489,000 4,862,160,000  
Additions         27,343,000 25,821,000  
Transfers         104,134,000 168,784,000  
Change in reclamation provision         17,541,000 (23,124,000)  
Disposals         (4,610,000) (27,311,000)  
Pre-commerical production revenue [1]         (22,818,000)    
Effect of movements in exchange rates         (55,967,000) (26,841,000)  
Property, plant and equipment, End of year 5,045,112,000   4,979,489,000   5,045,112,000 4,979,489,000  
Land and buildgings [Member] | Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         2,508,212,000 2,226,202,000  
Depreciation charge         137,896,000 196,564,000  
Transfers         48,209,000 27,101,000  
Disposals         (2,393,000) (21,736,000)  
Impairment charges         67,535,000 [2],[3] 97,152,000 [4],[5]  
Effect of movements in exchange rates         (42,210,000) (17,071,000)  
Property, plant and equipment, End of year 2,717,249,000   2,508,212,000   2,717,249,000 2,508,212,000  
Plant and equipment [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         1,179,590,000    
Property, plant and equipment, End of year 1,118,175,000   1,179,590,000   1,118,175,000 1,179,590,000  
Plant and equipment [member] | Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         2,640,543,000 2,528,488,000  
Additions         13,649,000 29,231,000  
Transfers         106,669,000 126,871,000  
Change in reclamation provision         0 0  
Disposals         (4,803,000) (34,611,000)  
Pre-commerical production revenue [1]         (6,487,000)    
Effect of movements in exchange rates         (19,936,000) (9,436,000)  
Property, plant and equipment, End of year 2,729,635,000   2,640,543,000   2,729,635,000 2,640,543,000  
Plant and equipment [member] | Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         1,460,953,000 1,353,308,000  
Depreciation charge         175,811,000 129,892,000  
Transfers         (35,243,000) (26,770,000)  
Disposals         (4,130,000) (19,794,000)  
Impairment charges         25,359,000 [2],[3] 28,677,000 [4],[5]  
Effect of movements in exchange rates         (11,290,000) (4,360,000)  
Property, plant and equipment, End of year 1,611,460,000   1,460,953,000   1,611,460,000 1,460,953,000  
Furniture and fixtures [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         14,576,000    
Property, plant and equipment, End of year 10,065,000   14,576,000   10,065,000 14,576,000  
Furniture and fixtures [Member] | Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         95,168,000 121,299,000  
Additions         3,521,000 9,355,000  
Transfers         (2,455,000) 3,410,000  
Change in reclamation provision         0 0  
Disposals         (4,578,000) (38,233,000)  
Pre-commerical production revenue         0    
Effect of movements in exchange rates         (839,000) (663,000)  
Property, plant and equipment, End of year 90,817,000   95,168,000   90,817,000 95,168,000  
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         80,592,000 110,444,000  
Depreciation charge         6,490,000 6,957,000  
Transfers         (2,451,000) (331,000)  
Disposals         (3,269,000) (37,981,000)  
Impairment charges         0 2,011,000 [4],[5]  
Effect of movements in exchange rates         (610,000) (508,000)  
Property, plant and equipment, End of year 80,752,000   80,592,000   80,752,000 80,592,000  
Under constructions [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         259,666,000    
Property, plant and equipment, End of year 98,899,000   259,666,000   98,899,000 259,666,000  
Under constructions [Member] | Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         340,340,000 512,301,000  
Additions         97,729,000 150,343,000  
Transfers         (208,359,000) (305,944,000)  
Change in reclamation provision         0 0  
Disposals         (74,482,000) (15,490,000)  
Pre-commerical production revenue         0    
Effect of movements in exchange rates         (497,000) (870,000)  
Property, plant and equipment, End of year 154,731,000   340,340,000   154,731,000 340,340,000  
Under constructions [Member] | Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         80,674,000 88,681,000  
Depreciation charge         0 0  
Transfers         (10,515,000) 0  
Disposals         (70,159,000) (10,603,000)  
Impairment charges         55,841,000 [2],[3] 2,596,000 [4],[5]  
Effect of movements in exchange rates         (9,000) 0  
Property, plant and equipment, End of year 55,832,000   80,674,000   55,832,000 80,674,000  
Under constructions [Member] | Accumulated depreciation and impairment [Member] | Uranium [Member] | McArthur River, Key Lake operations [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Impairment charges 55,333,000            
Exploration and evaluation [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         730,477,000    
Property, plant and equipment, End of year 636,890,000   730,477,000   636,890,000 730,477,000  
Exploration and evaluation [Member] | Cost [member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         1,120,641,000 1,147,100,000  
Additions         1,091,000 2,158,000  
Transfers         11,000 6,879,000  
Change in reclamation provision         0 0  
Disposals         0 0  
Pre-commerical production revenue         0    
Effect of movements in exchange rates         (1,463,000) (35,496,000)  
Property, plant and equipment, End of year 1,120,280,000   1,120,641,000   1,120,280,000 1,120,641,000  
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member]              
Disclosure Of Property Plant And Equipment [Line Items]              
Property, plant and equipment - Beginning of year         390,164,000 164,553,000  
Depreciation charge         0 198,000  
Transfers         0 0  
Disposals         0 0  
Impairment charges         91,046,000 [2],[3] 231,553,000 [4],[5]  
Effect of movements in exchange rates         2,180,000 (6,140,000)  
Property, plant and equipment, End of year $ 483,390,000   $ 390,164,000   $ 483,390,000 $ 390,164,000  
[1]

(a) During 2017, revenues of $ 29,305,000 from the sales of inventories before the commence ment of commercial production of JV Inkai Block 3 are recorded as a reduction of the respective mining assets.

[2]

(b) In the fourth quarter of 2017, all remaining proven and probable reserves of our US operations were reclassified to resources, indicating th at the mineable remaining pounds of U 3 O 8 no longer have demonstrated economic viability, but have reasonable prospects for economic extraction. In accordance with the provisions of IAS 36, Impairment of Assets , Cameco considered this to be an indicator tha t the assets of the two cash generating units in the US could potentially be impaired and accordingly, we were required to estimate the recoverable amount of these assets.

An impairment charge of $ 184,448,000 ($ 144,450,000 (USD)) was recognized as part of the uranium segment. The amount of the charge was determined as the excess of the carrying value over the recoverable amount which was based on a fair value less costs to sell model and categorized as a non-recurring level 3 fair value measurement. The rec overable amount was determined to be $ 133,228,000 ($ 106,200,000 (USD)) based on the fair value of resources in place using comparable market metrics.

[3]

(c) Also in the fourth quarter of 2017, Cameco announced the planned temporary suspension of production at the McArthur River/Key Lake operation. Due to this announcement, the Key Lake calciner project, which is part of the uranium segment and was initially undertaken to allow for an increase in annual production, was re-evaluated. As a result, the Company wro te off $ 55,333,000 of assets under construction on this project.

[4]

(d) In the fourth quarter of 2016, Cameco recognized a $ 237,621 ,000 impairment charge rela ting to Kintyre, its uranium exploration project in Australia. Due to the w eakening of the uranium m arket and the budget decision not to commit further expenditures to the project , the Company concluded it was appropriate to recognize an impairment charge. The charge was for the full carrying value of the CGU.

[5]

(e) In the second quarter of 2016, producti on was suspended at our Rabbit Lake operation in northern Saskatchewan. In accordance with the provisions of IAS 36, Impairment of Assets , Cameco considered this to be an indicator that the assets of the cash generating unit could potentially be impaired a nd accordingly, we were required to estimate the recoverable amount of these assets .

An impairment charge of $ 124,368,000 was recognized as part of the uranium segment. The charge was for the full carrying value of this cash generating unit. The recoverabl e amount of the mine and mill was based on a fair value less costs to sell model, which incorporated the future cash flows, including care and maintenance costs, expected to be derived from the operation. It was categorized as a non-recurring level 3 fair value measurement.

The discount rate used in the fair value less costs to sell calculation was 8 % and was determined based on a market participant’s incremental borrowing cost, adjusted for the marginal return that the participant would expect to use on an investment in the mine and mill. Other key assumptions included uranium price forecasts and operating and capital cost forecasts. Uranium prices applied in the calculation were based on approved internal price forecasts, which reflect management’s expecta tion of prices that a market participant would use. Operating and capital cost forecasts were determined based on management’s internal cost estimate s .